Hadoop Daemons not stopping

Question

I am trying to stop the daemon processes in hadoop by ./stop-all.sh script but it gives following message:

no jobtracker to stop localhost: no tasktracker to stop no namenode to stop localhost: no datanode to stop localhost: no secondarynamenode to stop

I tried to see if the hadoop is running after this using jps and it showed:

27948 SecondaryNameNode 27714 NameNode 28136 TaskTracker 27816 DataNode 28022 JobTracker 8174 Jps

That is, it's running all daemons properly. I also checked hadoop dfs -ls / to just see if I am able to connect to hdfs. It's working.

I am running stop-all.sh script by supergroup user meaning, there is no issue with permissions.

Chris White Chris White · Accepted Answer · 2012-05-09T10:36:25

This message is shown if the start/stop scripts cannot find a pid file got the deamon in the $HADOOP_PID_DIR folder (which defaults to /tmp).

If:

these files have been deleted (by someone or something), or
the env variable $HADOOP_PID_DIR has been changed since you started the deamons, or
the user stopping the deamons is not the user that started them

then hadoop will show the error messages you are seeing.

Selected portions from the hadoop-daemon.sh file (for 1.0.0):

#   HADOOP_IDENT_STRING   A string representing this instance of hadoop. $USER by default

if [ "$HADOOP_IDENT_STRING" = "" ]; then
  export HADOOP_IDENT_STRING="$USER"
fi

# ....

if [ "$HADOOP_PID_DIR" = "" ]; then
  HADOOP_PID_DIR=/tmp
fi    

# ....

pid=$HADOOP_PID_DIR/hadoop-$HADOOP_IDENT_STRING-$command.pid

# ....

(stop)

  if [ -f $pid ]; then
    if kill -0 `cat $pid` > /dev/null 2>&1; then
      echo stopping $command
      kill `cat $pid`
    else
      echo no $command to stop
    fi
  else
    echo no $command to stop
  fi
  ;;

Hadoop Daemons not stopping

1 Answers